.header{
    width: 1500px;
    height: 36px;
    background-color: grey;
    display: flex;
    align-items:center;/*垂直居中*/
    justify-content: center;/*水平居中*/
    background-color: #eeeeee;
    position: sticky;
    top:0;
    z-index: 99;
}
.header_text{
    width: 1280px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}
.location{
    width: 500px;
    font: 16px/20px '';
}
.arrows{
    display: inline-block;
    margin-top: 10px;
    /* border-top: 4px solid red;
    border-bottom: 4px solid #eeeeee;
    border-left: 4px solid #eeeeee;
    border-right: 4px solid #eeeeee; */
}
.user_msg span{
    display: inline-block;
    font: 16px/20px '';
    margin-left: 3px;
    margin-right: 3px;
    cursor: pointer;
}
.user_msg span a{
    color: #000;
}